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Functional morphology of the gonads of the articulate brachiopodTerebratulina retusa

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Abstract

The reproductive anatomy, and ultrastructural features of the gonads of the articulate brachiopodTerebratulina retusa (Linnaeus), are documented based on collections made between October 1985 and October 1986 from the Firth of Lorn, west coast of Scotland. This species is dioecious, and maturity is achieved in both sexes at shell lengths greater than ~5.5 mm. There is no obvious external sexual dimorphism except for slight differences in the coloration of the gonads; testes are white/cream, ovaries are yellow/orange. The gonads occur as four palmate lobes, a pair in each valve. Gonads are formed within a mantle sinus (vascula genitalia), which is an anterior extension of the coelom, that opens posteriorly into the visceral cavity and to the exterior via a pair of metanephridia. The latter serve as gonoducts during spawning. Gametes are borne on genital lamellae formed from a reticulate lattice of connective tissue. The lamellae are an extension of the ileoparietal band and are fused along one margin to the inner mantle membrane. Developing oocytes are closely affixed to the genital lamellae and originate from a pool of proliferating germ cells at its base. Vitellogenic oocytes that are at an advanced stage are released from the genital lamellae, but are retained within thevascula genitalia. Liberated oocytes continue to accumulate yolk and eventually occlude thevascula genitalia, before being spawned. Coelomocytes were identified within the gonads. In spent females these cells appear to be phagocytic and involved in the resorption of necrotic material, while in the male they may serve as nutritive cells.

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Author notes

  1. M. A. James

    Present address: Department of Zoology and Portobello Marine Laboratory, The University of Otago, Dunedin, New Zealand

Authors and Affiliations

  1. Department of Geology and Applied Geology, University of Glasgow, G12 8QQ, Glasgow, Scotland

    M. A. James & G. B. Curry

  2. Dunstaffnage Marine Laboratory, P.O. Box 3, PA34 4AD, Oban, Argyll, Scotland

    M. A. James & A. D. Ansell

Authors
  1. M. A. James
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  2. A. D. Ansell
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  3. G. B. Curry
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Communicated by J. Mauchline, Oban

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James, M.A., Ansell, A.D. & Curry, G.B. Functional morphology of the gonads of the articulate brachiopodTerebratulina retusa . Mar. Biol. 111, 401–410 (1991). https://doi.org/10.1007/BF01319412

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